Machine for making washers.



PATENTED MAY 1, 1906.

I H. 0. HART. MACHINE FOR MAKING WASHERS.

PATENTED MAY 1, 1906.

H. G. HART. MACHINE FOR MAKING WASHERS.

APPLIOATION FILED MAY 21, 1903. RENEWED NOY.11, 1905.

2 SHBETS-SHEET 2.

UNITED STATES PATENT, OFFICE.

Specification of Letters Patent.

Patented May 1,1906.

Application filed May 21, 1903. Renewed November 11,1905. Serial No. 286.912.

To (tZZ whom, it mag concern:

Be itknown that I, HUBERT C. HART, a

- citizen of the United States, residing at Unionsevering t ville, in the county of Hartfordand State of Connecticut, have invented new and useful Improvements in Machines for Making Washers, of which the following is a specification.

This invention relates to improvements in machines for makin split-ring washers, and is an improvement 0% my Patent No. 682,070, bearing date of September 3, 1901. In this patent the construction is such that it precludes the use of flat strips of metal; but I find that a good grade of washers can be produced from short flat metal strips by arranging the mechanism to form a groove or seat' to confine it while it is being bent into a ring and then flatten it with a predetermined pressure to remove the unevenness due to the bending of the metal on its edge. However, I do not, as in the former patent, a ply pressure sufficient to compress the wh lb body of metal, but simply flatten it'to give it a finish.

To this end it is the object of this invention to provide a mechanism comprising es sentially an anvil and mandrel, a plunger, mechanism for bending a strip of metal on its edge to form a ring around a mandrel and between an anvil and plunger, mechanism for feedingia metal strip, and mechanism for e strips, all of which operate in sequence to produce a split-ring washer from flat metal strips.v

It is highly important that the strip of metal be bent into a rin in a groove; and it is one of the principal o jeots of this invention to arrange a plunger relative to an anvil and mandrel so that the ring will be revented from excessive buckling in ben ing and yet not be hold tight enough to revent its proper bending around the mandre Furthermore, it is my purpose to make the diameter of the ring and the plunger'about the same and then apply pressure to the plunger, which will flatten the slight wrinkles or buckles in the ring and give the washer a finished appearance.

I desire to emphasize the fa t that I do not contemplate compressing the metal as described in my former patent, for which reason no provision has to be made to confine the peri hery of the strip.

The etails for accomplishing the objects,

' as well as the mode of operating my machine,

will now be fully set forth, and particularly 'pomted out in the claims.

In the drawings, Fi ure 1 is a perspective view of a conventiona machine for carrying out my invention. Fig. 2 is a vertical'sectional 'view. Fig. 3 is a transverse section taken through the mandrel, the strip of metal havin .just been introduced into its groove to be ent into a ring. Fig. 4 is a diegrammatic face view of the same. Fig. 5 is view similar to Fig. 3, but illustratin the strip asreceiving its first or initial end.

Fig. 6 is a conventional face view of the same. i Fig. 7 is a view similar to Fig. 5, the second bending of the strip having taken place. Fig. 8 is a conventional face View of the same. Fig. 9 is a view similar to Fig. 3, the third and last bend of the ring having been made and the plungermoved to flatten the ring. 10 1s a conventional face View of the same. Fig. 11 is a View similar to Fig. 9, but

showing the washer in the act of being flattened. Fig. 12 is a transverse section taken through the mandrel, the latter being withdrawn.

The same numerals refer to like parts in all the figures; but Iv desire it to be understood that the various mechanisms I have shown and shall describe are merely conventional.

Inasmuch as numerous mechanical expedif have for convenience of clearness shown the machine in the simplest conventional form.

The numeral 1 represents a frame; 2,, an anvil having an opening 3; 4, a mandrel, and 5 a ilunger.

The anvil has a slight flange 6 on its front face, against which a washer bears While it is being formed, and the mandrel is designed. to' be projected beyond the face of this flange The,

into a recess formed in the plunger 5. diameter of the plunger about e uals the diameter of the proposed washer, t e latter being bent on the mandrel in the groove or seat 8, formed by the flange 6 and the inner end of the plun er, said groove bein a )proximately' the widt ofthe thickness 0 t e strip from which the washer is to be made, the plunger being reciprocated at the appropriate time by a cam 9. A lever 10, connected by any convenient means, is employed to reci rocate the mandrel to permit removal of the 1i shed washers.

12 indicates a pair of feed-rolls between which the flat metal is fed to the mandrel. These rolls are geared together and are pcriodically revolved by a pawl-and-ratchet mechanism 13, connected to and timed to be operated with the rest of the machine. ter the metal has been fed forward the re quired distance it is cut into strips 15 of appro riate length by a cutter, (indicated at 14,) an which is operated by a cam 16.

When the strip 15 has been positioned on the mandrel and just subsequent to the cut, a plunger 17, adjustable by a set-screw 18, is forced into engagement with and gives the strip its initial bend. This plunger is reciprocated in ways 18 and is operated by a cam 20. About the time the plunger 17 con:- pletes its movement a horizontally-reciprocated slide 21, bearing rejections 22, is operated by a lever 23. he first movement of the slide causes one of the projections 22 to complete the bending of one terminal of the strip, and u on the reverse movement of said slide the ot er projection 22 bends the other terminal around the mandrel, which completes the ring.

The operation of my invention is substantially as follows: Assuming the parts to be in the position shown in Figs. 1, 3, and 4 that is, the metal strip has been fed into the groove 7 and onto the mandrel and is ready to be severed and bentat this oint it may be well to call attention to the act that the bending devices all act on the narrow edge of the stiip, and it is the'incident buckling due to this operation which requires a groove. Cams 20 and 16 are now operated, and by the time the cutter completes its mission the plunger 17 engages the strip, 1and as said plunger has a crotch 25 to stra e the washer upon its being depressed it bends the stri into a U shape, the upper art of the crotcli resting on and holding the bent strip ti ht to the mandrel, this 0 eration being 0 early shown in Fi 6. Sli e 21 now moves toward the mandrel, and one of the projections 22 contacts with one of the termmals 26 of the stri and bends it around the mandrel, which is t e second ste in the bending operation and is shown in ig. 8. Slide 21 is reciprocated in the opposite direction, (see Fig. 10,) and the companion projection 22 contacts with the other terminal 27 of the strip and completes its bending, and thus a ring is formed. However, the ring is somewhat rough, due to the bending, as hereinbefore described, a d to remove this and to give the washer a finish immediately after the bending is completed the cam 9 acts on the plunger 5 an'd flattens the washer between said plunger and the anvil, after which the lunger is withdrawn, and the lever 10 with raws the mandrel, and the finished washer drops out.

My invention is extremely simple in construction. and durable in character, and from the description herein given it is believed the neritsnnd operation will be fully compresurfaces on the ring hended by those skilled in the art to which it appertains.

It is to be understood that notwithstanding the description and showing of the means for completing the bending of the metal stock in two successive operations in this ap lication no claim to such is made herein, it eing reserved for and fully claimed in a copending application filed by me June 20, 1903, Serial N 0. 162,443.

What I claim as new is 1. In a machine of the class described, a mandrel, an anvil surrounding the mandrel, a horizontally-movable plunger, means for normally holding the lun 'er a distance from the face of the anvils ightl y greater than the washer stook to provide a groove for the washer, means for bending a stri about the mandrel and in the groove, an means for forcing the plunger against the washer.

2. In a machine of the class described, an anvil, a movable plunger, means for norm ally holding the plunger a distance from the face of the anvil slightly greater than the washer stock to form a Washer-securing groove, means for forming a ring in said groove, and means to force the plunger against the washer.

3. A machine of the class described, comprising a mandrel, an anvil, a plunger positioned to form a groove a distance from the anvil slightly greater than the width of the washer-stock to receive a fiat strip of metal, mechanism for bending the strip of metal edgewise around the mandrel and in the groove to form a split ring, and mechanism to move the plunger for flattening the rough when the latter is in the groove, substantial y as described.

4. A machine of the class described, comprising a mandrel, an anvil, a plunger normally positioned a distance from the anvil slightly wider than the washer-stock to form a groove of predetermined width around the mandrel, mechanism for introducing a strip of flat metal edgewise in the groove, mechanism for bending the metal strip edgewise into a ring, and mechanism for moving the plunger'ior decreasing the width of the groove to remove irregular surfaces on the ring toform a finished washer, substantially as described.

5. A machine of the class described, comprising a reciprocating mandrel, an anvil throu h which said mandrel operates, a movable p unger, having a seat for the mandrel, a plunger, means for holdin the plunger a distance from the anvil slight ly greater than the width of the washer-stock to form a groove, mechanism for introducing a fiat metal strip edgewise in the groove, mechanism for bending the fiat strip edgewise in the groove to form a split ring, and means for forcin the plunger toward the anvil to flatten and hnish. the ring to a washer, substantially as described.

6. A machine of the class described, comprisin an an '1, a movable lunger, means for ho ding th plunger spaced from the anvil a distance equal to the Width of the stock to form a groove, mechanism for introducing fiat strips of metal edgewise in the roove,

mechanism for giving an initial e gewise 7. A machine of the class described, comprising an anvil, a movable plunger, means [or holding the plunger normally spaced a predetermined distance from the anvil to form a washer-holding groove," mechanism for introducing fiat'strips of metal edgewise in the oove, mechanism for giving an initial edgewise bend to the strip, movable projections to successively act on the terminals of the initially-bent strip to form a split ring, means for moving said projections, and means for operating the plun er to decrease the width of the groove to atten and finish the ring to a Washer, substantially as described.

8. In a machine of the class described, an anvil, a movable plunger, means for holdin the plunger normallyspaced a predetermine distance from the anvil to form a oove, mechanism for introducing flat strips 0 metal edgewise in the groove, mechanism for giving an initial ed ewise bend to the strip, reciprocating slideearing projections, each of said respective projections contactln with a respective terminal of the initially- 'ent strip at each reci rocation of the slide to form a split ring, and means for operating the plunger to decrease the width of the groove to flatten and finish the ring in a washer, substantially as described.

9. A machine of the class described, comprising an anvil a mandrel reciprocating in the anvil, a movable plunger, means for normally holding the plunger spaced a predetermined' distance from the anvil to form a groove, mechanism for introducing a flat strip of metal edgewise in the groove, a vertically-moving plunger adapted to mitiallybend the strip edgewise in the oove and remain in contact with the sai strip, and .a reciprocating slide bearing two projections which respectively and successively contact with the respective terminals of the initiallybent strip to form the latter into a rim and means for 'operatin the lunger to atten the ring to form a 'shed washer, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HUBERT C. HART.

Witnesses:

DENIZA MATTHEWS, JNo. IMIRIE. 

